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Journal articles on the topic 'Phenolic ligands; 2'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Mamour, Sarr, Diop Mayoro, Thiam Elhadj Ibrahima, Gaye Mohamed, Barry Aliou Hamady та Javier Ellena. "{1-[1-(2-Hydroxyphenyl)ethylidene]-2-(pyridin-2-yl-κN)hydrazine-κ2 N′,O}{1-[1-(2-oxidophenyl)ethylidene]-2-(pyridin-2-yl-κN)hydrazine-κ2 N′,O}nickelate(II) nitrate hemihydrate". Acta Crystallographica Section E Crystallographic Communications 74, № 5 (2018): 642–45. http://dx.doi.org/10.1107/s2056989018005261.

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The 2-hydrazinopyridine precursor has been widely used to prepare ligands of various kinds by condensation with carbonyl compounds. These types of ligands are suitable for synthesizing novel transition metal (II) complexes with interesting magnetic properties. In this context we have synthesized the ligand 1-(2-hydroxyphenyl-2-ethylidene)-2-(pyridin-2-yl)hydrazine (HL) which was used in the preparation of the mononuclear title complex, [Ni(C13H12N3O)(C13H13N3O)]NO3·0.5H2O. As a result of the presence of HL and L in the [{Ni(HL)(L)}]+ unit, the complex appears to be a supramolecular dimer compo

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2

Liu, Yongchun, Zhengyin Yang, Kejun Zhang, Yun Wu, Jihua Zhu, and Tianlin Zhou. "Crystal Structures, Antioxidation, and DNA Binding Properties of SmIII Complexes." Australian Journal of Chemistry 64, no. 3 (2011): 345. http://dx.doi.org/10.1071/ch10302.

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The dinuclear SmIII complexes with 1:1 metal to ligand stoichiometry were prepared from Sm(NO3)3·6H2O and three anionic tetradentate Schiff-base ligands derived from 8-hydroxyquinoline-2-carboxyaldehyde with benzoylhydrazine, 2-hydroxybenzoylhydrazine, and isonicotinylhydrazine, respectively. All the ligands and complexes can bind strongly to calf thymus DNA through intercalation with the binding constants at 105–106 M–1, but complexes present stronger affinities to DNA than ligands. All the ligands and complexes have strong abilities of antioxidation, but complexes and ligands containing an a

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3

Kim, Yun Young, та Joseph M. Tanski. "Crystal structure of a rare trigonal bipyramidal titanium(IV) coordination complex: trichlorido(3,3′-di-tert-butyl-2′-hydroxy-5,5′,6,6′-tetramethyl-1,1′-biphenyl-2-olato-κO2)(tetrahydrofuran-κO)titanium(IV)". Acta Crystallographica Section E Crystallographic Communications 73, № 1 (2017): 88–91. http://dx.doi.org/10.1107/s2056989016020156.

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The title compound, [Ti(C24H33O2)Cl3(C4H8O)], is a rare example of a trigonal–bipyramidal titanium coordination complex with three chloride and two oxygen donor ligands. The asymmetric unit contains two independent molecules having essentially the same conformation. The molecules feature the titanium(IV) metal cation complexed with three chloride ligands, a tetrahydrofuran molecule, and one oxygen atom from the resolved ligand precursor (R)-(+)-5,5′,6,6′-tetramethyl-3,3′-di-t-butyl-1,1′-biphenyl-2,2′-diol, where the remaining phenolic hydrogen atom engages in intermolecular O—H...Cl hydrogen b

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4

Ayuba, Isiyaku, Tajo Siraj Ibrahim, Umar Maigari Aishatu, and Magaji Buhari. "Synthesis, characterization and anti-bacterial activity of Schiff Base and its mixed ligand complexes of Cr (II) and Co (II) containing vanillin and 2-aminophenol." Dutse Journal of Pure and Applied Sciences 7, no. 4a (2022): 98–104. http://dx.doi.org/10.4314/dujopas.v7i4a.11.

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Schiff Base are organic ligand that contained azomethine linkage (-HC=N-) which shows biological importance. Schiff Base from vanillin and 2-aminophenol was synthesized in 1:1 mole ratio. The complexes of Cr (II) and Co (II) from Schiff Base in 1:2 mole ratio metal-ligand (M-L) and the mixed ligand complexes from Schiff Base and 2-aminophenol in 1:1:1 mole ratio ligand-metal-ligand(L-M-L) were synthesized and characterized based on solubility, melting point, conductivity, Fourier transform infrared spectroscopy (FTIR) and ultraviolet (UV). The solubility result shows that, dimethyl sulfoxide(D

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5

Desalegn, Demise Sage. "Structural Elucidation of Cobalt (II) Complexes of 2-Imino-3-(2- hydroxyphenyl)-1-oxozolodin-4-one and Study of its Antimicrobial Relevance." Medicinal Chemistry 9, no. 2 (2019): 7. https://doi.org/10.4172/2161-0444.1000528.

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Complex of Co(II) with heterocyclic ligand [2-imino-3-(2-hydroxyphenyl)-1-oxazolodin-4-one] has been synthesized and characterized with the help of elemental analysis, magnetic, 1 H-NMR, 13C-NMR, IR and electronic spectral data. IR spectra exhibit the coordination of the ligands to the metal ion through deprotonated phenolic oxygen and heterocyclic nitrogen. All these studies reveal square planar geometry of Co (II) complexes. Synthesized compounds have also been screened against some micro-organisms viz. Escherichia coli, S. aureus, Aspergillus niger and R. bataticola by ‘paper disc&rsq

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6

Sunjuk, Mahmoud, Lana Al-Najjar, Majed Shtaiwi, et al. "Metal Complexes of Schiff Bases Prepared from Quinoline-3-Carbohydrazide with 2-Nitrobenzaldehyde, 2-Chlorobenzaldehyde and 2,4-Dihydroxybenzaldehyde: Structure and Biological Activity." Inorganics 11, no. 10 (2023): 412. http://dx.doi.org/10.3390/inorganics11100412.

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Three Schiff base ligands, NQ, CQ and HQ, were prepared from the reaction of quinoline-3-carbohydrazide with 2-nitrobenzaldehyde, 2-chlorobenzaldehyde and 2,4-dihydroxybenzaldehyde, respectively, and were investigated for their coordination to Cu (II), Ni(II), Co(II), Cd(II), Cr(III) and Fe(III) chlorides. The NQ preparation and the X-ray structure of NQ and CQ, as well as the transition metal complexes of NQ, CQ and HQ, were reported for the first time. FTIR, 1H-NMR, magnetic susceptibility and elemental analysis were used to study the coordination of ligands to the metal ions. Based on the m

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7

Mkwakwi, K., E. Hosten, R. Betz, A. Abrahams, and T. Madanhire. "The coordination behaviour of 2-((E)-(ferf-butylimino)methyl) phenol towards lanthanide nitrate and chloride salts." South African Journal of Chemistry 77 (2023): 36–41. http://dx.doi.org/10.17159/0379-4350/2023/v77a06.

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Five novel complexes were prepared by reacting 2-((E)-(tert-butylimino)methyl)phenol (HL2) with Ln(NO3)3xH2O (Ln = Gd and Dy ; x = 6 and 5, respectively) and LnCl3-6H2O (Ln = Nd, Gd and Dy). The crystal structures of the former two Ln(III) nitrate complexes are isostructural and the coordination sphere is composed of three monodentate HL2 ligands bonded to the metal centre through the phenolic oxygen atom and three nitrate ions coordinated in a bidentate fashion. Both complexes are nine-coordinate and SHAPE analysis reveals that they adopted a muffin polyhedra geometric type. The average Ln-On

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8

Lestari, Ayu Rahmania, Irmanida Batubara, Setyanto Tri Wahyudi, and Auliya Ilmiawati. "Phenolic Compound in Garlic (Allium sativum) and Black Garlic Potency as Antigout Using Molecular Docking Approach." Jurnal Kimia Sains dan Aplikasi 25, no. 7 (2022): 253–63. http://dx.doi.org/10.14710/jksa.25.7.253-263.

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Phenolics, including flavonoids, are bioactive components in garlic in relatively abundant amounts and are present 2–4 times more in black garlic. Both of these compounds are reported to have biological activity, with one of them acting as an antioxidant. However, its ability as an antigout is still not widely reported. Xanthine oxidase, adenine deaminase, guanine deaminase, purine nucleoside phosphorylase, and 5-Nucleotidase II are involved during the production of uric acid and causes gout. This study predicted the potential of the phenolic and flavonoid compounds in garlic and black garlic

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9

D. T. Sakhare. "Synthesis, Spectroscopic Characterization, In-Vitro and Antimicrobial Activities of Some Metal (II) Complexes of 5-choloro-2-(((4,6-Dimethoxypyrimidin-2-yl) Imino) Methyl) Phenol." International Journal of Scientific Research in Chemistry 9, no. 6 (2024): 01–09. https://doi.org/10.32628/ijsrch24961.

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The novel Schiff base ligand has been synthesized by the condensation of 5-chlorosalicylaldehyde and 2-amino-4,6-dimethoxypyrimidine. Metal complexes of the Schiff base were prepared by the reaction of the Schiff base and Iron nitrate in ethanol solution. The complexes isolated, washed and dried. The Schiff base is pale yellow, while Cu(II) and Mn(II) complexes is light yellow.The synthesized compounds have been characterized by FT-IR, 1H-NMR and UV-Vis techniques for the ligands and FT-IR, UV-Vis, all reactions monitored by TLC, molar conductivity and magnetic susceptibility measurements for

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10

El-Boraey, Hanaa, Randa Abdel-Rahman, Ensaf Atia, and Khalid Hilmy. "Spectroscopic, thermal and toxicity studies of some 2-amino — 3- cyano — 1, 5 -diphenylpyrrole containing Schiff bases copper (II) complexes." Open Chemistry 8, no. 4 (2010): 820–33. http://dx.doi.org/10.2478/s11532-010-0046-7.

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AbstractTwo novel Schiff base ligands of 2-amino-3-cyano-1,5-diphenylpyrrole and salicylaldehyde (HL1) or 2- hydroxy1-naphthylaldehyde (HL2) and their copper(II) complexes have been synthesized and characterized by elemental analyses, spectral (UV-Vis, IR, EPR, Mass (for ligands)), thermal (DTA-TGA) methods, magnetic and conductance measurements. IR results demonstrate the bidentate binding of the Schiff base ligands involving azomethine nitrogen, phenolic or naphtholic oxygen and suggest the presence of HL2 and complexes (1, 2, 4 and 8) in enolimine-ketonamine tautomeric forms in the solid st

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11

Jiao, Chen, Si-Si Zhang, Zuo-Yin Li, Jian-Jun Liu, Mei-Jin Lin, and Chang-Cang Huang. "Syntheses and structures of discrete copper(II) and cadmium(II) supramolecular complexes based on 1,4-diacylthiosemicarbazone ligands." Acta Crystallographica Section C Structural Chemistry 72, no. 2 (2016): 119–23. http://dx.doi.org/10.1107/s2053229616000310.

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Thiosemicarbazides and their metal complexes have attracted considerable interest because of their biological activities and their flexibility, which allows the ligands to bend and rotate freely to accommodate the coordination geometries of various metal centres. Discrete copper(II) and cadmium(II) complexes have been prepared by crystallization ofN-[2-(2-hydroxybenzoyl)hydrazinecarbonothioyl]propanamide (H3L) with Cu(CH3COO)2or Cd(NO3)2in a dimethylformamide/methanol mixed-solvent system at room temperature, affording the complexes di-μ-acetato-bis{μ4-1-[(2-oxidophenyl)carbonyl]-2-(propanamid

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12

Valarmathy, Govindaraj, Ramanathan Subbalakshmi, Rajendran Nithya, Ragu Nandhini, Balachandaran Sabarika, and Elanchleiyan Aarthy. "Synthesis, Spectral Characterisation and Cytotoxic Evaluation of Substituted Sulfonamide Schiff Bases." Indian Journal of Science and Technology 14, no. 34 (2021): 2731–41. https://doi.org/10.17485/IJST/v14i34.888.

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Abstract <strong>Objectives:</strong> To synthesize Schiff bases i.e 4-((2-hydroxybenzylidene)-amino–N-(5-methyl-1,2-oxozol-3- yl)benzene sulphonamide (L1), 4-((2-hydroxy benzylidene)-amino-N-(thiazol-yl)benzene sulphonamide (L2), 4-((2-hydroxybenzylidene)amino-N-(pyridin-2-yl)benzene sulphonamide by theaction of 2-hydroxybenzaldehyde with sulfathiazole/ sulfamethoxazole/ sulfapyridine in ethanolic media. <strong>Methods:</strong> The Schiff bases obtained were characterized by analytical data, IR, UV, 1H- NMR, 13C-NMR, Mass spectrum and monitored for cytotoxic activity ag

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13

Ferdian, Pamungkas Rizki, Rizki Rabeca Elfirta, Azra Zahrah Nadhirah Ikhwani, et al. "Studi In Silico Senyawa Fenolik Madu sebagai Kandidat Inhibitor Mpro SARS-CoV-2." Media Penelitian dan Pengembangan Kesehatan 31, no. 3 (2021): 213–32. http://dx.doi.org/10.22435/mpk.v31i3.4920.

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SARS-CoV-2 has caused a global COVID-19 pandemic since late 2019 and the reported cases have not ended until now. One way to overcome the Covid-19 pandemic is to find the main viral protease inhibitor (Mpro) SARS-CoV-2 which is a key enzyme of virus replication. Honey is a bee-derived product that contains various phenolic compounds and has antiviral activity. This study aimed to find candidate Mpro SARS-CoV-2 inhibitors from honey phenolic compounds using molecular docking simulations in a directed manner. A total of 27 test ligands (from honey’s phenolic compounds), 4 comparison ligands (fro

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14

Khaled, Shaikh, Mohammed Zamir Ahmed, Firdous G. Khan, and Shaikh Kabeer Ahmed. "Synthesis, Characterization, and Photophysical Studies of Some Novel Ruthenium(II) Polypyridine Complexes Derived from Benzothiazolyl hydrazones." International Journal of Inorganic Chemistry 2013 (October 2, 2013): 1–7. http://dx.doi.org/10.1155/2013/212435.

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A series of five benzothiazolylhydrazone ligands 3a–3e and their seven novel Ru(II) polypyridine complexes 4a–4d, 5a, 5d, 5e of the type [Ru(N–N)2(L)]Cl2, where (N–N)2 is 2,2′-bipyridine (bpy)2 or 1,10-phenanthroline (phen)2 and (L) is ligands 3a–3e, have been synthesized and characterized by elemental analysis, IR, 1H NMR, electronic absorption, and emission spectral studies. The interpretation of the analytical data revealed that the ligands coordinate with the metal ion in a bidentate fashion through azomethine nitrogen and phenolic oxygen to form complexes. These ligands and complexes also

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15

Nartop, Dilek, William Clegg, Ross W. Harrington, Richard A. Henderson, and Corinne Y. Wills. "Binding multidentate ligands to Ni2+: kinetic identification of preferential binding sites." Dalton Trans. 43, no. 8 (2014): 3372–82. http://dx.doi.org/10.1039/c3dt53359j.

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16

Vinod Kumar, V., and Savarimuthu Philip Anthony. "Coordinating ligand functionalized AgNPs for colorimetric sensing: effect of subtle structural and conformational change of ligand on the selectivity." RSC Adv. 4, no. 110 (2014): 64717–24. http://dx.doi.org/10.1039/c4ra13586e.

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17

Jamila, wazir. "SYNTHESIS AND CHARACTERIZATION OF SALICYLALDAZINE AND ITS METAL (II) COMPLEXES DERIVED FROM METAL (II) CHLORIDES." (International Journal of Medical Works 2, no. 11 (2016): 13–18. https://doi.org/10.5281/zenodo.167604.

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The salicylaldazine (ligand) and its metal (II) complexes like copper (II), nickel (II), zinc (II), cobalt (II) and manganese (II) complexes has been synthesized and characterized by different techniques using FTIR, UV-VIS spectroscopy. The ligand (salicylaldazine) is synthesized by the condensation reaction of salicylaldehyde and hydrazine sulfate. The salicylaldazine metal (II) complexes like Cu (II) , Ni(II), Zn (II), Co(II), Mn(II) were prepared by using metal (II) chloride in dioxane. The ratio of salicylaldazine and metal (II) chloride was 2:1 mole ration respectively. The resultant comp

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18

Sobola, Abdullahi, Gareth Watkins, and Brecht van. "Synthesis, characterization and biological study of Cu(II) complexes of aminopyridine and (aminomethyl)pyridine Schiff bases." Journal of the Serbian Chemical Society 83, no. 7-8 (2018): 809–19. http://dx.doi.org/10.2298/jsc170913002s.

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The synthesis, characterization and antimicrobial activity determination of some aminopyridine- and (aminomethyl)pyridine?salicylaldimine copper(II) complexes were realized. The ligands, L1?L6, were prepared by condensing salicylaldehyde and o-vanillin with 2- and 3-amino- and (aminomethyl)pyridine, respectively. The complexes were characterized by micro-analytical, electronic, infrared and conductivity data. The structures of the Schiff base ligands were further confirmed from 1H- and 13C-NMR spectral data. This study established that salicylaldimine ligands could coordinate as neutral specie

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Zaitsev, Kirill V., Andrey D. Trubachev, and Oleg Kh Poleshchuk. "Germanium Complexes with ONO Tridentate Ligands: O-H Bond Activation Control According to DFT Calculations." International Journal of Molecular Sciences 24, no. 12 (2023): 10218. http://dx.doi.org/10.3390/ijms241210218.

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Polydentate ligands are used for thermodynamic stabilization of tetrylenes—low-valent derivatives of Group 14 elements (E = Si, Ge, Sn, Pb). This work shows by DFT calculations how the structure (the presence or absence of substituents) and type (alcoholic, Alk, or phenolic, Ar) of tridentate ligands 2,6-pyridinobis(1,2-ethanols) [AlkONOR]H2 and 2,6-pyridinobis(1,2-phenols) [ArONOR]H2 (R = H, Me) may affect the reactivity or stabilization of tetrylene, indicating the unprecedented behavior of Main Group elements. This enables the unique control of the type of the occurring reaction. We found t

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Vidya, V. G., and V. Sadasivan. "Synthesis, spectroscopic characterization and biological activities of some metal complexes with new heterocyclic azodye ligand 2-(2-hydroxynaphthalen-1-yl azo)-pyridin-3-ol." Current Chemistry Letters 12, no. 1 (2023): 55–64. http://dx.doi.org/10.5267/j.ccl.2022.9.006.

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Metal complexes of [2-(2-hydroxynaphthalen-1-ylazo)-pyridin-3-ol] are derived from 2-amino-3-hydroxypyridine and β-naphthol was synthesized and characterized by thermal, spectral and analytical tools. The ligand was reacted with Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II) in 1:2 stoichiometry. The IR spectra confirms the azo ligand coordination to metal ions via azo nitrogen and phenolic oxygen of pyridine after deprotonation. Both IR and 1HNMR spectra recorded involvement of deprotonated hydroxyl groups with proton displacement. The magnified fluorescence was shown by Mn(II) and Ni(II)

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Mapari, A. K., M. S. Hate, and K. V. Mangaonkar. "Synthesis, Characterization and Antimicrobial Activity of Mixed Schiff Base Ligand Complexes of Co(II), Ni(II), Cu(II) and Zn(II)." E-Journal of Chemistry 8, no. 3 (2011): 1258–63. http://dx.doi.org/10.1155/2011/598171.

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The mixed ligand complexes of Co(II), Ni(II), Cu(II) and Zn(II) with Schiff basesN-(2-hydroxy-1-naphthylidene)-4-methylaniline (L1H) andN-(2-hydroxybenzylidene)-2,3-dimethylaniline (L2H) have been synthesized and characterized. The resulting complexes were characterized by elemental analysis, thermogravimetric analysis, magnetic moment measurements, conductivity measurements,1H NMR, IR, UV-visible and ESR spectral studies. The Schiff bases acts as bidentate monobasic ligands, coordinating through deprotonated phenolic oxygen and azomethine nitrogen atoms. The complexes are non-electrolytic in

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22

Faizi, Md Serajul Haque, Necmi Dege, James Pogrebetsky та Turganbay S. Iskenderov. "Structural characterization and DFT study of bis{(S)-2-[(2-hydroxybenzyl)amino]-3-(4-hydroxyphenyl)propanoato-κ2 N,O}(1,10-phenanthroline-κ2 N,N′)cadmium(II) tetrahydrate". Acta Crystallographica Section E Crystallographic Communications 74, № 9 (2018): 1339–43. http://dx.doi.org/10.1107/s205698901801157x.

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In the title compound, [Cd(C16H16O3)2(C12H8N2)]·4H2O, the Cd ion lies on a twofold rotation axis and is chelated by two monodeprotonated residues of the L-tyrosine-derived ligand (S)-2-[(2-hydroxybenzyl)amino]-3-(4-hydroxyphenyl)propanoic acid (L) in a κ2 N,O amino acid chelating mode, exhibiting an (N,N′)-trans disposition, and by 1,10-phenanthroline in a κ2 N,N′ mode. The latter ligand is also located about the twofold rotation axis that bisects the central six-members ring. The phenolic groups remain protonated and non-coordinating and take part as acceptors in the intramolecular hydrogen b

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Cai, Xue, та Hui Ning. "Crystal structure of di-μ-acetato-diacetatobis(μ-6,6′-dimethoxy-2,2′-{[(propane-1,3-diylbis(azanylylidene)]bis(methanylylidene)}diphenolato)tetrazinc". Acta Crystallographica Section E Crystallographic Communications 71, № 12 (2015): m217—m218. http://dx.doi.org/10.1107/s2056989015020551.

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The tetranuclear title complex, [Zn4(C19H20N2O4)2(CH3COO)4], is formed from two dinuclear motifs related by an inversion centre. The two crystallographically independent ZnIIions in the asymmetric unit are in different coordination environments. One is square-based pyramidal with one O atom of an acetate group occupying the axial position and two N and O atoms of one bmspd [H2bmspd =N,N′-bis(3-methoxysalicylidene)propylene-1,3-diamine] Schiff base ligand forming the basal plane. The other ZnIIatom is six-coordinated by four O atoms of the bmspd ligand forming the equatoral plane and two O atom

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Rani, C. Vidya, K.Dhahagani, and I. Bernadette Amali. "SYNTHESIS, SPECTRAL CHARACTERIZATIONS AND CATALYTIC ACTIVITY OF M (II) COMPLEXES DERIVED FROM SCHIFF BASE LIGAND 5-DIETHYLAMINO-2-({[4- (DIMETHYLAMINO) PHENYL] IMINO} METHYL) PHENOL." Juni Khyat 15, no. 02 (2025): 39–48. https://doi.org/10.36893/jk.2025.v15i2.012.

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A new series of metal complexes of the type M(L)2 ([Cu(L)2] (1), [Ni(L)2] (2), ;Schiff base (L) derived has been synthesized by condensation in acidic medium and characterized by elemental analysis (C, N, O). The spectral (IR, UV, 1H NMR and EPR) studies are also carried out. The molecular structures of the Schiff base ligand (L) is determined by the single crystal X-ray diffraction technique. The ligand (L) is crystallized into a monoclinic lattice with a space group of P21. The Schiff base ligand (L), C19H25N3O, is approximately planar, with a dihedral angle of 9.03 (13)° between the planes

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Wagh, Shaila, and B. R. Patil. "SYNTHESIS, SPECTRAL, THERMAL AND ANTIMICROBIAL STUDIES OF NEW METAL COMPLEXES OF SUBSTITUTED HYDROXY PROPIOPHENONE." RASAYAN Journal of Chemistry 15, no. 03 (2022): 1718–27. http://dx.doi.org/10.31788/rjc.2022.1536355.

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A new series of metal complexes of innovative bisketimines (L1 - L5) have been synthesized. Schiff base ligands were synthesized by condensing substituted 2’- hydroxy propiophenone and ethylene diamine. The synthesized Schiff bases act as tetradentate ligands with two nitrogen and two phenolic oxygen groups and co-ordinates with Co (II), Ni (II), Cu (II) and Zn (II) salts. Ligands and their metal complexes have been studied using 1H NMR, IR, UV-Vis and thermogravimetric techniques. The complexes were crystalline, according to the XRD pattern. The thermogravimetric data revealed the thermal sta

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Yeole, Sanjay, Vaibhava Sachin More, S. Lokhande R., Suhas Janwadkar, and Dilip Yadav. "Synthesis, Spectral, and Antimicrobial Activity of Some Mixed Ligand Co (II) Complexes of Schiff Base 2-[(3-Hydroxy Phenylimino) Methyl]-4-Nitrophenol with Some Amino Acids." International Journal of Advance and Applied Research 6, no. 25 (2025): 150–55. https://doi.org/10.5281/zenodo.15294469.

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<strong>Abstract:</strong> The mixed ligand complexes of Co (II) with 2-[(3-hydroxy phenylimino)methyl]-4-nitrophenol (HPIMNP) as the primary ligand and amino acids (valine, alanine, or glutamine) as secondary ligands have been synthesised and characterised. The complexes were characterised by elemental analysis, conductivity measurement, 1H NMR, IR, and ultraviolet-visible spectral studies. Schiff base acts as a bidentate ligand, coordinating through deprotonated phenolic oxygen and azomethine <em>N</em>-atom. The conductivity studies of the complexes in DMSO at 10⁻³ M concentration indi

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Khalil, Hany Ezzat, Turki Saeed Aldakheel, Anas AlAhmed, Promise Madu Emeka, and Mahmoud Kandeel. "Anti-proliferative activity of leaves of Launaea capitata Asteraceae: Phytochemical, cytotoxicity and in silico studies." Tropical Journal of Pharmaceutical Research 19, no. 10 (2020): 2129–36. http://dx.doi.org/10.4314/tjpr.v19i10.17.

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Purpose: To investigate the phytochemical contents of Launaea capitata (L. capitate) and its potential cytotoxic activity. Also, to examine its molecular modeling by docking of the isolated compounds.Methods: L. capitata was methanol-extracted and successively fractionated followed by determination of the total phenolic and flavonoid contents. Major constituents were isolated and purified. 3-(4, 5- Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) cytotoxicity assays were conducted for all fractions. In silico studies were conducted using four anticancer target kinases, namely, p

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Albahadly, Hassan H., Nahed H. Al-Haidery, and Bushra K. Al-Salami. "Synthesis, Biological Activity of Trimethoprim derivative and the Complexes." Journal of Physics: Conference Series 2063, no. 1 (2021): 012014. http://dx.doi.org/10.1088/1742-6596/2063/1/012014.

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Abstract This study demonstrates the synthesis of new ligands derived from trimethoprim with their Iron(III) and copper (ll) complexes. At the beginning, preparing new ligands, the first namly N, N’-(5-(3,4,5-trimethoxybenzyl)pyrimidine-2,4-diyl)bis(3,4,5-trihydroxy benza mide)and the Ligand second namly N, N’-(((5-(3,4,5-trimethoxybenzyl)pyrimidine-2,4-diyl) bis(azanediyl))bis(carbonthioyl) bis(3,4,5-trihydroxybenzamide) which prepared by nucleophilic addition of trimethoprim to Gallic chloride and prepared also by nucleophilic addition of trimethoprim to the Solution of Ammonium thiocyanate

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Sakhare, D. T. "Synthesis, Characterization and Biological Activity of New Pyrimidine Schiff Base and Its Cu(II), Ni(II) Complexes." Asian Journal of Chemical Sciences 15, no. 1 (2025): 138–47. https://doi.org/10.9734/ajocs/2025/v15i1355.

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The novel Schiff base ligand (E)-2-(((2-hydroxynaphthalen-1-yl)methylene)amino)-6-methylpyrimidin-4-ol has been attained through the condensation of 2-amino-4-hydroxy-6-methylpyrimidine and 2-hydroxy-1-naphthaldehyde. Metal complexes of the Schiff base were formed by the interaction of the Schiff base and metal nitrate in an ethanol solution. The complexes were isolated, cleaned, and dried. The Schiff base appears pale yellow, whereas the Cu(II) and Ni(II) complexes exhibit a light yellow color. The synthesized compounds have been characterized by FT-IR, 1H-NMR, and UV-Vis techniques for the l

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30

Ejidike, Ikechukwu P., and Peter A. Ajibade. "Synthesis, Characterization, Antioxidant, and Antibacterial Studies of Some Metal(II) Complexes of Tetradentate Schiff Base Ligand: (4E)-4-[(2-{(E)-[1-(2,4-Dihydroxyphenyl)ethylidene]amino}ethyl)imino]pentan-2-one." Bioinorganic Chemistry and Applications 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/890734.

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Co(II), Ni(II), Cu(II), and Zn(II) complexes of (4E)-4-[(2-{(E)-[1-(2,4-dihydroxyphenyl)ethylidene]amino}ethyl)imino]pentan-2-one have been synthesized and characterized by elemental analyses, molar conductance, electronic and IR spectral studies, and XRD. FTIR confirmed the ligand coordinates the metal ion to form mononuclear complex via the oxygen and nitrogen atoms of the phenolic group and azomethine group, respectively. Tetrahedral geometry is proposed for Co(II) complex and square-planar geometry for Ni(II) and Cu(II) complexes. The antibacterial studies of the compounds were determined

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31

V., Mishra. "Coordination polymers of copper( II) imides with polymeric heterocyclic Schiff bases of thiazole derivatives." Journal of India Chemical Society Vol. 79, Apr 2002 (2002): 374–75. https://doi.org/10.5281/zenodo.5849358.

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Department of Post- Graduate Studies in Chemistry, Nehru College, Chhibramau-209 721, India <em>Manuscript received 29 September 2000. revised 26 July 2001. accepted 1 September 2001</em> Two polymeric ligands, L<sub>1</sub> and L<sub>2</sub> were synthesized by polymerizing new heterocyclic Schiff bases 2-hydroxy-1-benzylidene-2-amino· 4-phenylthiazole and 2-hydroxy-1-benzylidene-2-amino-4-phenyl-5-phenylazothiazole, with 1,6-dichlorohexane. L<sub>1</sub>. L<sub>2</sub> gave solid chelates with copper( II) phthalimide or succinimide. The metal ion is coordinated through nitrogen of imi

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32

Gauri, D. Bajju, Kaur Shradha, and Kaur Sukhbinder. "Synthesis and spectroscopic studies of CoII salicylates with N -donors." Journal of Indian Chemical Society Vol. 82, Jul 2005 (2005): 589–93. https://doi.org/10.5281/zenodo.5830332.

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Department of Chemistry, University of Jammu, Jammu-180 006, India <em>Manuscript received 19 January 2004, revised 13 August 2004, accepted 11 April 2005</em> Co<sup>II</sup> salicylate react with various N-donors in organic medium (ethanol) to give solid complexes having general formula [M{O<sub>2</sub>C(OH)R}<sub>2</sub>]L<sub>2</sub> where R = C<sub>6</sub>H<sub>4</sub>, L = 3- and 4-CNPy; α, β and &upsih;-picolene; 3,4- and 3,5-lutidine and isoquinolene. Co<sup>II </sup>salicylate forms oily complex with 2-CNPy, which did not give reproducible results. All the complexes ar

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33

Wilson, JG. "Phenolic Analogs of Amino Carboxylic Acid Ligands for 99mTc. 4. N-(2-Hydroxybenzyl)glycines (hbg)." Australian Journal of Chemistry 43, no. 7 (1990): 1283. http://dx.doi.org/10.1071/ch9901283.

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Ten tridentate ligands , N-(2-hydroxybenzyl) glycines ( hbg ) (5), were prepared by the Mannich reaction of a phenol with formaldehyde and glycine and/or by the reduction of the Schiff base of a substituted salicylaldehyde and glycine. In three instances the bis compounds (6b,c,i) were also formed by the first method.

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34

Ifaya, Mus, Ida Musfiroh, Sahidin та ін. "MOLECULAR DOCKING AND DYNAMICS SIMULATIONS OF FENOLIC CONTENTS ON HENNA PLANT (Lawsonia inermis L.) AS ANTIDIBETIC THROUGH INHIBITION OF DIGESTIVE ENZYME α-AMYLASE". RASAYAN Journal of Chemistry 15, № 02 (2022): 861–69. http://dx.doi.org/10.31788/rjc.2022.1526654.

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Diabetes mellitus is a disease caused by high blood glucose levels, and one way to overcome it is by inhibiting the digestive enzyme, α-amylase. The henna plant (Lawsonia inermis L.) has been shown to show potential as an antidiabetic through inhibition of the enzyme digestive, but its molecular mechanism has not been revealed. Therefore, the aim of this study was to reveal the α-amylase enzyme inhibitory activity of phenolic compounds in the henna plant by molecular docking and molecular dynamics. The protein used was a high-resolution α-amylase crystallographic protein with the code PDB: 1XD

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35

Gonçalves, Elaine C. D., Gabriela M. Baldasso, Maíra A. Bicca, Rodrigo S. Paes, Raffaele Capasso, and Rafael C. Dutra. "Terpenoids, Cannabimimetic Ligands, beyond the Cannabis Plant." Molecules 25, no. 7 (2020): 1567. http://dx.doi.org/10.3390/molecules25071567.

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Medicinal use of Cannabis sativa L. has an extensive history and it was essential in the discovery of phytocannabinoids, including the Cannabis major psychoactive compound—Δ9-tetrahydrocannabinol (Δ9-THC)—as well as the G-protein-coupled cannabinoid receptors (CBR), named cannabinoid receptor type-1 (CB1R) and cannabinoid receptor type-2 (CB2R), both part of the now known endocannabinoid system (ECS). Cannabinoids is a vast term that defines several compounds that have been characterized in three categories: (i) endogenous, (ii) synthetic, and (iii) phytocannabinoids, and are able to modulate

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36

Krishna, P. Murali, B. S. Shankara, and N. Shashidhar Reddy. "Synthesis, Characterization, and Biological Studies of Binuclear Copper(II) Complexes of (2E)-2-(2-Hydroxy-3-Methoxybenzylidene)-4N-Substituted Hydrazinecarbothioamides." International Journal of Inorganic Chemistry 2013 (July 11, 2013): 1–11. http://dx.doi.org/10.1155/2013/741269.

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Four novel binuclear copper(II) complexes [1–4] of (2E)-2-(2-hydroxy-3-methoxybenzylidene)-4N-substituted hydrazinecarbothioamides, (OH)(OCH3)C6H4CH=NNHC(S)NHR, where R = H (L1), Me (L2), Et (L3), or Ph (L4), have been synthesized and characterized. The FT-IR spectral data suggested the attachment of copper(II) ion to ligand moiety through the azomethine nitrogen, thioketonic sulphur, and phenolic-O. The spectroscopic characterization indicates the dissociation of dimeric complex into mononuclear [Cu(L)Cl] units in polar solvents like DMSO, where L is monoanionic thiosemicarbazone. The DNA bin

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37

Modanawal, Vishnu Kumar, Siddharth Agrawal, Arvind Kumar Pandey, Subhash Chandra Shrivastava, and Shekhar Srivastava. "Synthesis, spectral and biological studies of cobalt(II) and copper(II) complexes with Schiff base ligands." Research Journal of Chemistry and Environment 26, no. 9 (2022): 73–83. http://dx.doi.org/10.25303/2609rjce073083.

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Four new Co (II) and Cu (II) metal complexes were synthesized with bidentate Schiff base ligands 4-(2-hydroxy-3 methoxybenzylideneamino) -N-(4-methylpyrimidin-2-yl) benzenesulfonamide (L-1) and 4-(2-hydroxybenzylideneamino)-N-(4methylpyrimidin -2-yl) benzenesulfonamide (L-2). These complexes were characterized by elemental analysis, IR, UV, PXRD. and mass spectrometry techniques. The surface morphology was characterized by SEM analysis. The ligands act as bidentate and can coordinate with metal ions through nitrogen of the azomethine and oxygen of the phenolic groups present in Schiff bases. T

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38

O., P. POKHARIYAL. "Titanium(IV) and Zirconium(lV) Complexes of N-4-Methyl-7 -hydroxy-8-acetocoumarinylidene Anthranilic Acid/ o-Aminophenol." Journal of Indian Chemical Society Vol. 62, Jun 1985 (1985): 416–17. https://doi.org/10.5281/zenodo.6318789.

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Chemistry Department, M. M. College, Khekra-201 101 <em>Manuscript received 28 November 1982, revised 12 October 1981, accepted 8 June 1985</em> Complexes of Ti<sup>IV</sup> and Zr<sup>IV</sup> with Schiff base ligands <em>N</em>-4-methyl-7-hydroxy-8- acetocoumarinylidene anthranilic acid (H<sub>2</sub>MHACAA) and <em>N</em>-4-methyl-7-hydroxy-8- acetocoumarinylidene-<em>o</em>-aminophenol (H<sub>2</sub>MHACAP) have been isolated and characterised on the basis of various physicochemical studies. Infrared spectral data show 'bat the ligands art as tridentate chelating agents coord

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39

Madhukar, V., and S. Jyothi. "Design, synthesis, spectral characterization and antibacterial studies of transition metal complexes of benzothiophene Schiff base." Research Journal of Chemistry and Environment 29, no. 2 (2024): 12–17. https://doi.org/10.25303/292rjce012017.

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In the present work, a series of benzothiophene based Schiff base ligands 2-((E)-(1-methyl-3-nitro-1H-pyrazol-5-ylimino)methyl)benzo[b]thiophen-3-ol and their Cu(II), Co(II) and Ni(II) complexes were synthesized and characterized by physical, analytical and spectral data such as elemental analysis, FT-IR, 1H NMR, 13C NMR, ESI-Mass, UV-vis studies. Spectro-analytical experimental data confirms that all of these metal complexes have a square planar shape. The synthesized Schiff base coordinates to the metal through imine nitrogen and phenolic oxygen atoms, making it a monobasic bi-dentate ligand

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40

B., Rupini, Mamatha K., Mogili R., Ravinder M., and Srihari S. "Synthesis and characterization of oxovanadium(IV), cobalt(II), nickei(II), copper(II) and palladium(II) complexes of some coumarin-based Schiff bases." Journal of Indian Chemical Society Vol. 84, Jul 2007 (2007): 629–31. https://doi.org/10.5281/zenodo.5823754.

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Department of Chemistry, Sri Venkateswara Degree College, South Campus, Delhi University, Delhi -110 007, India Department of Chemistry, Kakatiya University, Warangal-506 009, Andhra Pradesh, India <em>E-mail</em> : sriharisomu@yahoo.co.in <em>Manuscript received 14 June 2006, revised 7 May 2007, accepted 11 May 2007</em> The complexes of VO<sup>2</sup>+, CO<sup>2</sup>+, Ni<sup>2</sup>+, Cu<sup>2</sup>+ and Pd<sup>2</sup>+complexes of Schiff bases derived from the condensation reaction of 3-(2-amino-4-thiazolyl)coumarin with 2-hydroxybenzaldehyde, 2-hydroxy-3-methoxybenzaldehyde and 2- hydrox

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41

(Mrs), PAPIA CHATTERJEE, HARJIT KAUR DUGGAL (Miss), V. AGARWALA B., and K. DEY ARUN. "Bipositive Metal Complexes of Novel Schiff Bases derived from Carbazides and 2-Aminopyridine." Journal Of India Chemical Society Vol.66, Aug-Oct 1989 (1989): 550–57. https://doi.org/10.5281/zenodo.5995418.

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Chemical Laboratories, University of Allahabad, Allahabad-211 002 Six Schiff base chelating ligands, viz. vanillin semicarbazone (VSC), 2-furaldehyde semicarbazone (FSC), vanillin thiosemicarbazone (VTSC), 2-furaldehyde thiosemicarbozone (FTSC). salicylaldehyde-2-aminopyridine (SAP) and 2-hydroxy-1- naphthaldehyde-2-aminopyridine (HNAP) and their complexes largely with bipositive cations are synthesised. The first four ligands exist in keto form but form complexes through deprotonated enolic form and the azomethine nitrogen to yield six-coordinated complexes with 2 moles of water are

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42

Kadhim, Ayyat Jawad, and Naser Shaalan. "Synthesis, Characterization, Biological, and Antioxidant Activity of New Metal Ion Complexes with Schiff Base Derived from 2-Hydroxybenzohydrazide." Indonesian Journal of Chemistry 24, no. 6 (2024): 1851. https://doi.org/10.22146/ijc.98292.

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The study involved the synthesis of new complexes with tetradentate ligand (LH). The general formula of complexes was [M(LH)(H2O)2] with M of Ni2+, Co2+, Cu2+, and Zn+. The ligand was synthesized by treating the 2-hydroxybenzohydrazide with salicylaldehyde. The structural characteristics of ligands and complexes were analyzed using various techniques, including elemental analyses, magnetic susceptibility, molar conductivity, infrared, ultraviolet absorption, mass, and NMR spectroscopy studies. The physical measurements indicated that the prepared complexes are non-electrolyte and showed that t

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43

Kudo, Yoshihiro, Noboru Yoshida, and Masatoshi Fujimoto. "Formation of theN,N-Bidentate Chelates of 2-(2-Pyridylazo)phenolic Ligands with Nickel(II) in Nonaqueous Solvents." Bulletin of the Chemical Society of Japan 59, no. 3 (1986): 795–802. http://dx.doi.org/10.1246/bcsj.59.795.

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44

Nisha, Singh, K. Sangwan Naresh, and S. Dhindsa Kuldip. "Complexes of derivatives of 4,5-dihydro-1H-pyrazole as potential pesticides." Journal of Indian Chemical Society Vol. 78, Mar 2001 (2001): 119–22. https://doi.org/10.5281/zenodo.5849432.

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Department of Chemistry, CCS Haryana Agricultural University, Hisar-125 004, India <em>Manuscript received 22 March 2000, revised 4 September 2000, accepted 30 November 2000</em> Cyclization of 3-aryl-1-(2-hydroxyphenyl)prop-2-en-1-ones with hydrazine hydrate in refluxing acetic acid furnishes 1-acetyl-5-aryl-4,5-dihydro-3-(2-hydroxypheny1)-1<em>H</em>-pyrazoles HL<sup>1</sup>-HL<sup>4</sup>, Ar = Ph, 4-CH<sub>3</sub>O-C<sub>6</sub>H<sub>4</sub>_, 2-furyl, 2-thienyl, respectively). Refluxing of ligands HL<sup>1</sup>-HL<sup>4</sup> with Mn<sup>II</sup>, Co<sup>II</sup>, Ni<sup>II</sup>, C

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45

Gauri, D. Bajju, Kundan Sujata, and Kumar Anand Sunil. "Synthesis and characterization of axially ligated zinc(II)-para-nitro-mesotetraphenylporphyrin." Journal of Indian Chemical Society Vol. 88, Oct 2011 (2011): 1483–92. https://doi.org/10.5281/zenodo.5790419.

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Department of Chemistry, University of Jammu, New Campus, Baba Sahib Ambedkar Road, Jammu-180 006, Jammu & Kashmir, India <em>E-mail</em> : gauribajju@gmail.com <em>Manuscript received 10 December 2010, accepted 09 March 2011</em> Reaction of p-nitro-meso-tetraphenylporphyrin (p-NO<sub>2</sub>-H<sub>2</sub> TPP) with zinc(n) acetate (Zn(OAc)<sub>2</sub>) and phenol result in the formation of corresponding axially ligated zinc(II)-p-nitro-meso-tetraphenylporphyrin (X-Zn<sup>II</sup>-p-NO<sub>2</sub> TPP) (where X = axial phenolic ligands and TPP = tetraphenylporphyrin). The four-coordinated

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46

Mi, Xiuna, Dafei Sheng, Suna Wang, Jing Lu, Lu Yang, and Zhen Zhou. "Killing two birds with one stone: 2D+2D→3D parallel stacking and 3D self-penetrating structures in one reaction and their crystal-to-crystal transformation." Acta Crystallographica Section C Structural Chemistry 75, no. 6 (2019): 657–66. http://dx.doi.org/10.1107/s2053229619005850.

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Reaction of the flexible phenolic carboxylate ligand 2-(3,5-dicarboxylbenzyloxy)benzoic acid (H3 L) with nickel salts in the presence of 1,2-bis(pyridin-4-yl)ethylene (bpe) leads to the generation of a mixture of the two complexes under solvolthermal conditions, namely poly[[aqua[μ-1,2-bis(pyridin-4-yl)ethylene-κ2 N:N′]{μ-5-[(2-carboxyphenoxy)methyl]benzene-1,3-dicarboxylato-κ3 O 1,O 1′:O 3}nickel(II)] dimethylformamide hemisolvate monohydrate], {[Ni(C16H10O7)(C12H10N2)(H2O)]·0.5C3H7NO·H2O} n or {[Ni(HL)(bpe)(H2O)]·0.5DMF·H2O} n , 1, and poly[[diaquatris[μ-1,2-bis(pyridin-4-yl)ethylene-κ2 N:N′

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47

Haddad, Mohamed, Roger Gaudreault, Gabriel Sasseville, et al. "Molecular Interactions of Tannic Acid with Proteins Associated with SARS-CoV-2 Infectivity." International Journal of Molecular Sciences 23, no. 5 (2022): 2643. http://dx.doi.org/10.3390/ijms23052643.

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The overall impact of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) on our society is unprecedented. The identification of small natural ligands that could prevent the entry and/or replication of the coronavirus remains a pertinent approach to fight the coronavirus disease (COVID-19) pandemic. Previously, we showed that the phenolic compounds corilagin and 1,3,6-tri-O-galloyl-β-D-glucose (TGG) inhibit the interaction between the SARS-CoV-2 spike protein receptor binding domain (RBD) and angiotensin-converting enzyme 2 (ACE2), the SARS-CoV-2 target receptor on the cell membrane o

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48

Rekha, Rani, Ranjan Rajeeva, C. Bhattacharjee N., Sharma S., and Suraiya Afshan. "Spectroscopic characterization of some copper(II) complexes." Journal of Indian Chemical Society Vol. 90, Mar 2013 (2013): 331–36. https://doi.org/10.5281/zenodo.5769591.

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University Department of Chemistry, Magadh University, Bodh Gaya-824 234, Bihar, India G.B.M. College, Gaya-823 001, Bihar, India <em>Manuscript received 29 November 2011, revised 02 May 2012, accepted 14 May 2012</em> 1-(Phenylazo)-2-naphthol (PANH) has three potential donor sites and thus it acts as a very good chelating agent. This ligand has been used for complexation with Cu<sup>II</sup> ions to synthesize the complexes of general formula Cu(PAN)<sub>2</sub> Ln, where L = secondary ligands like pyridine, picoline, H<sub>2</sub>O and n = 0, 1 and 2. These complexes have been

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49

Wilson, JG. "Phenolic Analogs of Amino Carboxylic-Acid Ligands for Tc-99m. 3. N-(2-Hydroxybenzyl) Sarcosines (Hbs)." Australian Journal of Chemistry 43, no. 4 (1990): 783. http://dx.doi.org/10.1071/ch9900783.

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50

Jarallah, Hanadi Mahdi, and Safaa Hussein Ali. "Synthesis, Characterization, Thermal Analysis, DFT, and Computational/Anti-Corrosion Studies for New Azo Metal Complexes." Indonesian Journal of Chemistry 25, no. 2 (2025): 534. https://doi.org/10.22146/ijc.101069.

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Two new azo-substituted ligands (L1 and L2) were synthesized in a two-step reaction involving condensation between diazonium salt and hydroxyanisole. L1 is (E)-2-(tert-butyl)-6-((4-chlorophenyl)diazenyl)-4-methoxyphenol, and L2 is (E)-2-((3-(tert-butyl)-2-hydroxy-5-methoxyphenyl)diazenyl)benzoic acid. These ligands were employed to synthesize four new bidentate azo metal complexes [MCl2(Lx)] (x = 1 or 2, M = Ni(II) or Cu(II)). The prepared compounds were characterized using various structural analysis techniques, including IR, EI-mass, 1H-NMR, 13C-NMR, and thermogravimetric analysis (TGA). The

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